Search PubMed⌕ Search

Biomedical subjects

H Yilmaz

Publications and source records attributed to H Yilmaz.

At least 37 records · Page 2Linked to original sources
PubMed2003

Cholesterol ester transfer protein, apolipoprotein E and lipoprotein lipase genotypes in patients with coronary artery disease in the Turkish population.

The aim of this study was to compare patients with coronary artery disease (CAD) to healthy objects, in order to explore a possible association between CAD and the variants in the gene encoding cholesterol ester transfer protein (CETP), apolipoprotein E (Apo E) and lipoprotein lipase (LPL). The relationship between CETP MspI, apo E and LPL PvuII gene polymorphisms and serum lipids were investigated in 173 patients with CAD and 111 healthy controls. The frequency of Apo epsilon4 (p < 0.05) and CETP M1 (p < 0.01) alleles were higher in the CAD group than in the control group. In the CAD group, those with the Msp M1 allele had higher levels of total cholesterol (TC) (p = 0026) and low-density lipoprotein cholesterol (LDL-C) than those with the Msp M2 allele. Subjects with an epsilon2 allele had the lowest levels of TC and LDL-C, while subjects with the epsilon4 allele had the highest. In the control group, CETP, the Msp M2 allele was associated with a higher level of high-density lipoprotein cholesterol (HDL-C) (p = 0.012) than the Msp M1 allele. The distributions of LPL genotype and allele did not differ between the CAD and control groups. The present study demonstrates that the CETP Msp1 and Apo E gene polymorphisms are associated with variations in lipids in patients with CAD and healthy controls in Turkish population.

Adult↗
PubMed2002

Voice analysis and videolaryngostroboscopy in patients with Parkinson's disease.

Parkinson's disease (PD) is clinically characterized by a resting tremor, bradykinesia, cogwheel phenomenon, rigidity, disorder of postural reflexes and especially changes in voice and speech. We studied 30 PD patients who were treated with dopamine and 20 normal subjects as the control group. The parameters of vocal fold edges, glottal closure, vertical levels of cords, amplitude of vibration, mucosal wave, vibratory behavior, phase symmetry, ventricular folds and movements, periodicity, arytenoids and thick mucous were evaluated by videolaryngostroboscopy. The Unified Parkinson's Disease Rating Scale was applied to the patient group. The voices of the patients were evaluated by the Dr.Speech-4 and Spectra-PRO computer programs. Maximum phonation time, fundamental frequency, amplitude and the harmonic-to-noise ratio were recorded and compared with those of the control group. The abnormal videolaryngostroboscopic findings were more frequent in the PD group (70% versus 45%; P<0.05). Voice analysis showed significant differences in the parameters such as maximum phonation time, maximum fundamental frequency, the frequency range and the harmonic-to-noise ratio. We thought that these methods and parameters yielded sufficient information for diagnosis and follow-up of vocal function in patients with PD.

Female↗
PubMed2002

Detection of antibodies to Borna disease virus (BDV) in Turkish horse sera using recombinant p40. Brief report.

The nucleoprotein of Borna disease virus (BDV-p40) was produced in a Baculovirus expression system using sf9 cells. The purity and specificity of the recombinant p40 was confirmed by SDS-PAGE and immunoblotting. The recombinant p40 was used in an ELISA to screen horse sera in Turkey. For this, 323 horses from selected cities in the Marmara region of Turkey were examined clinically and serum was collected from each. All horses were clinically healthy except for a few with wounds on the skin. Antibodies to BDV were detected in the sera of 82 (25%) of 323 horse sera. Six sera were selected that had low, medium or high OD values by ELISA and were analysed by Western blotting. All reacted specifically with p40 at a dilution of 1 in 1000. This is the first report of the detection of Borna disease in Turkey and needs further molecular biological investigations to compare the Turkish strains with those strains detected in Europe.

Animals↗
PubMed2001

Detection of antibodies to Borna disease virus in Turkish cats by using recombinant p40.

Recombinant p40 produced by baculovirus was used in an ELISA to screen samples of serum taken from 80 cats in Istanbul. The sera were also analysed for feline immunodeficiency virus (FIV) and feline leukaemia virus (FeLV). Antibodies to Borna disease virus- (BDV) p40 were detected in 34 (42-5 per cent) of the 80 cats. Seventy-three per cent of the sera which were positive for FIV and 26 per cent of the sera which were negative for FIV had antibodies to BDV. There was no difference in the percentage of sera which were positive for BDV between the cats that were positive or negative for FeLV. Three of the cats had neurological disease and two of these had antibodies to BDV. Six sera with low, medium or high optical densities (ODS) by ELISA were analysed by Western blotting. Only the sera with medium and high ODS reacted specifically with p40 at a dilution of 1 in 1,000.

Adjuvants, Immunologic↗
PubMed2001

Is epsilon4 allele of apolipoprotein E associated with more severe end-organ damage in essential hypertension?

The aim of the present study comparing patients with mild to moderate hypertension with controls, was to explore a possible association between hypertension-related target organ damage and evaluation found in the gene encoding apolipoprotein E (apo E) genotype. Detailed medical history was recorded and physical examination was performed for all patients in the study (88 hypertensives, 63 normotensive controls). PCR (Polymerase Chain Reaction), RFLP (Restriction Fragment Length Polymorphism), and agarose gel electrophoresis techniques were used to determine the apo E genotypes. The frequencies of apo epsilon2, apo epsilon3, and apo epsilon4 alleles were 3.97, 88.06, and 9.95%, respectively in the hypertensive group. The frequencies of apo epsilon2, apo epsilon3, and apo epsilon4 alleles were 5.5, 92.0, and 2.38%, respectively in the control group. There were about twice as many individuals in the heterozygote hypertensive group who had apo E3/4 as compared to the control group (7.30 vs. 2.38%) (p = 0.07). The hypertensive patients who were carriers of the apo epsilon4 had significantly higher organ damage (left ventricular hypertrophy (p < 0.001). dilated left atrium (p < 0.05), retinopathy (p < 0.05)) as compared to those who were not carriers of apo epsilon4. These results showed a trend for the epsilon4 allele to be associated with a higher prevalence of target organ damage in patients with mild to moderate hypertension.

Adult↗
PubMed2001

Is there a role of angiotensin-converting enzyme gene polymorphism in the failure of arteriovenous femoral shunts for hemodialysis?

In humans, thrombosis and neointimal hyperplasia are the major factors responsible for prosthetic graft occlusion. Previous studies suggest that the renin-angiotensin system is one of the key enzymes in the vascular system and has been implicated in the pathogenesis of thrombosis and neointimal hyperplasia. We conducted a case-control study to determine the frequency of the different angiotensin-converting enzyme (ACE) genotypes among the patients who had PTFE graft implantation for hemodialysis access. Between 1997 and 1999, 30 graft implantations were performed. Twelve individuals (40%) developed thrombotic complications, 8 of the 12 patients had ACE ID polymorphism, and 2 patients had DD and 2 patients had II polymorphism. The ID polymorphism was significantly more frequent in the thrombosed arteriovenous (A-V) grafts than in nonthrombosed A-V grafts (chi2 = 7.57 and p = 0.02). Overall, the frequency of the D and I alleles was 66.6 and 33.3%, respectively. In conclusion, ID polymorphism of the ACE gene plays an important role in the pathogenesis of vascular access thrombosis in subjects undergoing hemodialysis for chronic renal failure.

Adolescent↗
PubMed2001

Lipoprotein abnormalities in patients with secondary renal amyloidosis.

The prevalance of hyperlipidemia in chronic renal failure (CRF) patients is higher than in general population. Secondary amyloidosis is a common cause of CRF in Turkey. In this study, 25 patients with CRF due to secondary renal amyloidosis (amyloid-CRF), 15 patients with CRF without amyloidosis-CRF and 17 healthy controls were studied for serum lipid parameters. The mean serum lipoprotein (a) [LP(a)] level in the patients with amyloid-CRF was significantly higher than in the controls (p < 0.01). The mean serum apolipoprotein B (Apo B), apolipoprotein E (Apo E) and triglyceride levels in the patients with amyloid-CRF were very significantly higher than in the controls (p < 0.001). The mean serum total cholesterol, low-density lipoprotein (LDL) levels in the patients with amyloid-CRF were higher than in the controls (p < 0.05). The mean serum apo AI levels in the patients with amyloid-CRF was very significantly lower than in the controls (p < 0.001). The mean serum high-density lipoprotein (HDL) in the patients with amyloid-CRF was lower than in the controls (p < 0.05). The mean serum Lp (a), Apo AI, Apo B and Apo E levels in the patients with amyloid-CRF were significantly higher than in the patients with CRF (p < 0.01). The mean serum total cholesterol, trigliserides, LDL and HDL levels in the patients with amyloid-CRF were higher than in the patients with CRF (p < 0.05). There was not any correlation with serum lipid parameters and serum albumin and urine protein levels (p > 0.05). Our study suggests that serum lipid parameters are abnormal and might be the risk factor of atherosclerotic vascular disease and contribute to renal disease progression in the patients with secondary renal amyloidosis and lipid abnormalities were different from CRF with various etiology, without amyloidosis.

Adolescent↗
PubMed2001

Risk factors for coronary heart disease in patients with spinal cord injury in Turkey.

OBJECTIVE: To compare the standard risk factors for coronary heart disease (CHD), defined in National Cholesterol Education Program II (NCEP II) of Turkish spinal cord injury (SCI) patients with healthy controls, discuss the results according to the findings in Turkish population, and SCI patients in the literature. DESIGN: We assessed 52 age and sex matched healthy control subjects, and 69 SCI patients (16 females, 53 males with the mean age of 33.9+/-11.37 years) with time since injury of 12.8+/-13.45 months. The study consisted of 45 paraplegics, and 24 tetraplegics with 54% incomplete, and 46% complete injury. RESULTS: Risk factors for CHD according to NCEP II were; age and sex in 16%, positive family history in 0%, cigarette smoking in 54%, hypertension (HT) in 0%, high total cholesterol (TC) in 32%, high low-density lipoprotein cholesterol (LDL) in 41%, low high-density lipoprotein cholesterol (HDL) in 52%, and diabetes mellitus (DM) in 7% of our SCI patients, respectively. Compared to controls DM, high TC, LDL, and low HDL were statistically more frequent in SCI patients. We found a negative correlation between serum HDL and time since injury. TC (186+/-32 vs 205+/-36; P=0.025), TC/HDL (5.34+/-1.17 vs 6.26+/-1.5; P=0.005), and LDL/HDL (3.57+/-0.9 vs 4.16+/-1.3; P=0.027) were significantly increased in patients with time since injury of more than 1 year, while HDL levels (35.8+/-6.36 vs 33.86+/-6.47; P=0.213) decreased without reaching statistical significance. The lipid profiles did not show any correlation with the neurological level, and completeness of lesions. CONCLUSIONS: SCI confers additional CHD risk over that present inherently in the parent population due to enforced sedentary lifestyle and this increases with time since injury. The preliminary study consisting of 26 patients was accepted for poster presentation in Copenhagen, Denmark (18-20 June 1999) at the 38th Annual Scientific Meeting of IMSOP in association with the Nordic Medical Society of Paraplegia.

Adult↗
PubMed2001

Spinal cord injury caused by gunshot wound during pregnancy.

We report a case of a pregnant woman with acute spinal cord injury (C5) caused by gunshot wound and discuss the respective maternal and fetal considerations. Neither decompressive surgery nor corticosteroid protocols were used. At 37 weeks, the patient delivered a normal female infant after induction of labor and epidural anesthesia, with no medical or obstetrical complications. With conservative management and rehabilitation, this patient had significant recovery of function.

Adult↗
PubMed2001

Increased plasma levels of interleukin-6 and interleukin-8 in beta-thalassaemia major.

Several immunological defects can be found in patients with beta-thalassaemia, among which the impairment of neurophil and macrophage phagocytic and killing functions and the production of some cytokines are the most important. It is known that interleukin-6 (IL-6) and interleukin-8 (IL-8) are important components of the pro-inflammatory response. The plasma levels of these cytokines may be relevant in the pathophysiology of beta-thalassaemia. To assess this hypothesis, the plasma IL-6 and IL-8 concentrations in patients with beta-thalassaemia, were investigated. Fourteen patients with thalassaemia major were studied by evaluating body iron status, iron supply for erythropoiesis, and plasma IL-6 and IL-8 levels, together with 12 age-matched healthy controls. The plasma levels of IL-6 and IL-8 were determined by enzyme-linked immunosorbent assay (ELISA). Patients with beta-thalassaemia were found to have higher IL-8 concentrations than normal controls (p < 0.001) and plasma IL-6 concentrations increased significantly in the beta-thalassaemic patients compared with control subjects (p = 0.01). Serum ferritin levels of beta-thalassaemic patients were significantly higher than those of control groups (p < 0.05). IL-8 levels correlated with ferritin levels (r = 0.694; p < 0.05) and the total number of transfusions (r = 0.64; p < 0.05). Plasma IL-6 levels in beta-thalassaemic patients did not correlate with any clinical, haematological or biochemical parameters. It was also found that plasma IL-8 levels in the patients who had blood transfusions over 100 times were significantly higher than those of under 100 times (p < 0.05), whereas there was no statistical difference for IL-6. Markedly increased plasma IL-6 and IL-8 levels were documented in patients with beta-thalassaemia. Increased production of IL-6 and IL-8 might have contributed to abnormalities in iron metabolism and it is probably due to overstimulation of macrophages. Before a clinical value can be ascribed to these changes in plasma cytokine levels in beta-thalassaemia, the follow-up samples of larger series of patients with 8-thalassaemia should be evaluated.

Adolescent↗
PubMed2001

Sidebranch occlusion in direct intracoronary stenting: predictors and results.

We assessed the angiographic predictors and results of major (> 1 mm) sidebranch occlusion (SBO) following direct intracoronary stenting (DS) in 86 patients. The occlusion of a sidebranch is a well-defined risk after balloon angioplasty and stenting. However, the impact of direct stenting without predilatation on the coronary flow of sidebranches emerging within the stented segment has not been studied solely. A total of 111 sidebranches were analyzed. Sidebranch type, take-off angle, ostial involvement and procedural characteristics were evaluated. Nine out of 111 (8%) stent-covered sidebranches were occluded. Sidebranches with > 50% stenosis that take off within or just beyond the diseased portion of the lesion (unfavorable morphology) were the most powerful morphologic predictor of SBO (odds ratio: 8.0; 95% confidence interval: 1.5--40.8; p = 0.007). Take-off angle of the sidebranch was not found to have any effect on SBO. Post-stent dilation using high-pressure inflation (15.0 +/- 2.1 atmospheres), inflation (odds ratio: 1.1; 95% CI: 1.0--1.2; p = 0.038), and 3 times inflation (odds ratio: 4.5; 95% CI: 1.1--18.3; p = 0.023) were the procedural predictor of SBO. Of those 40 unfavorable morphologies, seven (17.5%) were occluded compared to 2.8% (2/71) of the favorable morphologies. Nine out of 9 (100%) occluded after high-pressure inflation. Three patients complained of chest pain and 1 had non-Q wave myocardial infarction attributed to SBO. These findings indicate that the incidence of SBO and complications are less than expected and has a favorable outcome in direct intracoronary stenting.

Angioplasty, Balloon, Coronary↗
PubMed2001

[Left main coronary artery stent application: early and late period results].

OBJECTIVES: Percutaneous coronary intervention of left main coronary artery (LMCA) in the setting of acute myocardial infarction or in patients with cardiac and non-cardiac diseases that increase mortality rate after coronary artery bypass surgery has been proposed as "last resort option" and these patients can be managed safely with intracoronary stenting. In this study, we evaluated the short- and long-term follow-up outcomes of patients with left main coronary lesions underwent stent implantation in our clinic. METHOD: A total of 15 patients (12 M, 3 F; mean age 58 +/- 13 years) with left main coronary stenosis considered at high risk for surgical treatment or patients with acute myocardial infarction with LMCA stenosis were enrolled into the study and treated by stenting. Eight patients were treated for unstable angina (53%), 2 had stable angina (13%) and 5 had acute myocardial infarction (33%). Three patients had "protected" and 12 patients "unprotected" LMCA stenosis. An intraaortic balloon pump was used in 6 (40%) and pacemaker in 4 (26.6%) patients. RESULTS: In the study group the short and long-term mortality rate was 4 (26.6%). Among 13 survived cases, signs of left ventricular failure developed in 2 patients (15.3%). Restenosis rate on control coronary angiography was revealed in 28.8% of cases. CONCLUSION: Utilization of elective stenting in patients at high surgical risk with protected and unprotected LMCA lesions and percutaneous coronary intervention in patients with acute myocardial infarction and left main coronary artery lesions could be appraised as an alternative to surgical treatment approaches.

Angioplasty, Balloon, Coronary↗